TorrentFreak obtained a June 8-dated letter where the Mountain View, Calif.-based Company threatened to take legal action against the conversion website, which, according to Google’s numbers, rakes 1.3-million daily visitors.

Google’s video-sharing platform is free and provides content that is embeddable or accessible through its API, while YouTube-MP3.org is free, pulls audio from YouTube videos, and then converts those files into downloadable MP3s. Apparently, despite the API that gives developers access to many features, pirating any sound directly violates YouTube’s Terms of Service agreement.

The leaked letter addresses the website’s owner, Philip. In the warning, YouTube’s Associate Product Counsel Harris Cohen cited the platform’s terms for API, where he maintained that separating, isolating, or modifying “the audio or video components of any YouTube audiovisual content made available through the YouTube API” is strictly prohibited.

Cohen threatened “legal consequences” for YouTube-Mp3.org, and he gave the website a week to comply. TorrentFreak spoke with Philip, who said YouTube does not want to negotiate. He also mentioned Google immediately blocked his website’s servers from accessing YouTube.

“We would estimate that there are roughly 200 million people across the world that make use of services like ours and Google doesn’t just ignore all those people, they are about to criminalize them. With the way they are interpreting and creating their ToS every one of those 200 million users is threatened to be sued by Google,” explained Philip.

As TorrentFreak further noted, a search for “YouTube MP3″ aggregates a slew of audio-cropping alternatives. But, Google might also target those similar services.